CVE-2026-53331 (GCVE-0-2026-53331)

Vulnerability from cvelistv5 – Published: 2026-07-01 13:32 – Updated: 2026-07-01 13:32
VLAI?
Title
slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl->lock
Summary
In the Linux kernel, the following vulnerability has been resolved: slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl->lock During the SSR/PDR down notification the tx_lock is taken with the intent to provide synchronization with active DMA transfers. But during this period qcom_slim_ngd_down() is invoked, which ends up in slim_report_absent(), which takes the slim_controller lock. In multiple other codepaths these two locks are taken in the opposite order (i.e. slim_controller then tx_lock). The result is a lockdep splat, and a possible deadlock: rprocctl/449 is trying to acquire lock: ffff00009793e620 (&ctrl->lock){+.+.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus but task is already holding lock: ffff00009793fb50 (&ctrl->tx_lock){+.+.}-{4:4}, at: qcom_slim_ngd_ssr_pdr_notify (drivers/slimbus/qcom-ngd-ctrl.c:1475) slim_qcom_ngd_ctrl which lock already depends on the new lock. Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ctrl->tx_lock); lock(&ctrl->lock); lock(&ctrl->tx_lock); lock(&ctrl->lock); The assumption is that the comment refers to the desire to not call qcom_slim_ngd_exit_dma() while we have an ongoing DMA TX transaction. But any such transaction is initiated and completed within a single qcom_slim_ngd_xfer_msg(). Prior to calling qcom_slim_ngd_exit_dma() the slim_controller is torn down, all child devices are notified that the slimbus is gone and the child devices are removed. Stop taking the tx_lock in qcom_slim_ngd_ssr_pdr_notify() to avoid the deadlock.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 3d1561537237c6cc1db76155183d8bbdac2339f0 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < dc4d5c57e012c2c669793deb1515a57bbc6bf5dd (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < d54a221b0f3cd9e1f03f18104be34e02a8258fae (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < aad4337a21b9ad3ae8d668fa8678d05e26ecbaa8 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 9f0d45d509b434c54da10e01f4ef8086e4583401 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 9708eb50fd7343145b422be852f890212155d845 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 55f2ea9ff83cc27a85526b14bc9b32f96a08d6ec (git)
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    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/slimbus/qcom-ngd-ctrl.c"
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              "lessThanOrEqual": "6.18.*",
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      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl-\u003elock\n\nDuring the SSR/PDR down notification the tx_lock is taken with the\nintent to provide synchronization with active DMA transfers.\n\nBut during this period qcom_slim_ngd_down() is invoked, which ends up in\nslim_report_absent(), which takes the slim_controller lock. In multiple\nother codepaths these two locks are taken in the opposite order (i.e.\nslim_controller then tx_lock).\n\nThe result is a lockdep splat, and a possible deadlock:\n\n  rprocctl/449 is trying to acquire lock:\n  ffff00009793e620 (\u0026ctrl-\u003elock){+.+.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus\n\n  but task is already holding lock:\n  ffff00009793fb50 (\u0026ctrl-\u003etx_lock){+.+.}-{4:4}, at: qcom_slim_ngd_ssr_pdr_notify (drivers/slimbus/qcom-ngd-ctrl.c:1475) slim_qcom_ngd_ctrl\n\n  which lock already depends on the new lock.\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   lock(\u0026ctrl-\u003etx_lock);\n                                lock(\u0026ctrl-\u003elock);\n                                lock(\u0026ctrl-\u003etx_lock);\n   lock(\u0026ctrl-\u003elock);\n\nThe assumption is that the comment refers to the desire to not call\nqcom_slim_ngd_exit_dma() while we have an ongoing DMA TX transaction.\nBut any such transaction is initiated and completed within a single\nqcom_slim_ngd_xfer_msg().\n\nPrior to calling qcom_slim_ngd_exit_dma() the slim_controller is torn\ndown, all child devices are notified that the slimbus is gone and the\nchild devices are removed.\n\nStop taking the tx_lock in qcom_slim_ngd_ssr_pdr_notify() to avoid the\ndeadlock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T13:32:15.733Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3d1561537237c6cc1db76155183d8bbdac2339f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc4d5c57e012c2c669793deb1515a57bbc6bf5dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/d54a221b0f3cd9e1f03f18104be34e02a8258fae"
        },
        {
          "url": "https://git.kernel.org/stable/c/aad4337a21b9ad3ae8d668fa8678d05e26ecbaa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f0d45d509b434c54da10e01f4ef8086e4583401"
        },
        {
          "url": "https://git.kernel.org/stable/c/9708eb50fd7343145b422be852f890212155d845"
        },
        {
          "url": "https://git.kernel.org/stable/c/55f2ea9ff83cc27a85526b14bc9b32f96a08d6ec"
        }
      ],
      "title": "slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl-\u003elock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53331",
    "datePublished": "2026-07-01T13:32:15.733Z",
    "dateReserved": "2026-06-09T07:44:35.398Z",
    "dateUpdated": "2026-07-01T13:32:15.733Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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